Display screen or portion thereof with a graphical user interface for physiological monitoring



The sole FIGURE is a front view of a display screen or portion thereof with a graphical user interface for physiological monitoring.

The dashed broken line showing of an electronic device and portions of the graphical user interface depict environmental structure that forms no part of the claimed design. The dashed broken line perimeter adjacent to the solid line rectangle indicates the boundaries of the claim and forms no part thereof. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface for physiological monitoring, as shown and described. 